Too much black liquorice could land you in hospital with an irregular heart rhythm, or arrhythmia

Several studies have linked liquorice to heart problems and packets of the treat often contain a warning that anyone with high blood pressure or underlying heart problems should not eat too much.

And one study even linked it to ovary damage and infertility.

The findings, which were reported in the journal Reproductive Toxicology, reveal that exposure to high levels of isoliquiritigenin, a compound found in liquorice, can affect aromatase – an enzyme that converts testosterone to oestrogen.

Linda Katz, from the FDA, said potassium levels in the body are usually restored to normal levels when a person stops eating liquorice.